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Select the correct events that occur dur...

Select the correct events that occur during inspration.
(a) Contraction of diaphragm
(b) Contraction of external inter-costal muscles
(c) Pulmonary volume decreases
(d) Intra pulmonary pressure increases

A

(a) and (b)

B

(c) and (d)

C

(a),(b) and (d)

D

only (d)

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